Elevator doorlock



'March 4 1924. 1,486,093 J. B. KAISER ELEVATOR DOORLOCK Filed Sept; 8, 1922 INVENTOI? JOHN 5164/35.?

A TTOR/IIEYS Patented Mar. 4, 1924.

7 JOHN B. KAISER, 01E HELENA, MONTANA. 7

ELEVATOR DOORLOCK.

Application filed September 8, 1922. Serial No. 586,913.

T 0 all whom it may concern.

Be it known that 1, JOHN B. KAISER, a citizen of the United States, and a resident of Helena, in the county of Lewis and Clark, and State of Montana, have invented a new and Improved Elevator Doorlock, of which the following is a full, clear, and exact desoription.

This invention relates to improvements in door locks, and more particluarly to a door lock especially adapted for use on elevator doors, or the door of elevator shafting, an

object of the invention being to provide a lock of the character stated, which automatically locks the door when closed, which has no projecting or protruding hooks on the lock which. are unsightly and dangerous, and which is entirely on the inside of the door, and can be conveniently and easily operated.

A further object is to provide a lock of the character stated, which can be manufactured and installed at a reasonably low price, which will insure a positive locking of the door when closed, and yet can be conveniently and easily released when it is desired to open the door.

With these and other objects in view, the invention consists in certain novel features of construction and combinations, and arrangement of parts, as will be more fully hereinafter described and pointed out in the claims.

In the accompanying drawings- Figure 1 is a view in elevation showing the door in partly opened position.

Figure 2 is an enlarged View in section showing the position of the locking pawl when the door is closed.

Figure 3 is a view similar to Figure 2 showing the position of the operating handle.

Figure f is an enlarged View in elevation showing the knuckle joint connecting the two shaft sections.

1 represents a door frame and 2 a sliding door supported on rollers 3 and mounted to run on a track 4, although it is to be understood that my invention applies to any style of silding door, but is particularly adapted for elevators as above set forth.

On the door 2, spaced brackets 5 are secured and provide rotary mounting for aligned shaft sections 6 and 7. These shaft sections are connected by a knuckle joint 8 which permits a certain amount of indepurpose which will hereinafter appear.

On the upper end of shaft section 6 which projects above the top of door 2, a pawl 9 is fixed and this pawl 9 is adapted to ride over the teeth of a fixed ratchetblock 10 on the frame 1, and lock the door in closed position.

A collar 11 is removably and adjustably fixed to the shaft section 6, and a coiled spring 12 is located around the shaft section 6 between the upper bearing bracket 5 and the collar 11 and fixedly connected to said bracket and collar so that it functions to exert rotar tension on the upper shaft section 6 to orce the pawl 9 toward the frame 1 into locked engagement with the ratchet block 10.

On the lower shaft section 7 an angular handle 18 is fixed and this angular handle functions to permit the operator to slide the door and also to turn the shaft sections 7 and 6 and release the pawl 9 from locked engagement with the ratchet block 10.

As above stated the knuckle joint. 8 permits a certain amount of independent movement of the shaft sections 6 and 7 so that the pawl 9 can freely ride over the ratchet block in closing without changing the position of the handle 13, but this independent motion is relatively slight so that when the handle is moved to cause the shaft section 7 to turn, the pawl 9 can be readilyreleased and the door opened.

Various slight changes might be made in the general form and arrangement of parts described without departing from my invention, and hence I do not limit myself to the precise details set forth, but consider myself at libertyto make such changes and alterations as fairly fall within the spirit and scope of the appended claims.

I claim:

1. A door lock of the character described, comprising a support, aligned shaft sections mounted on the support and having a limited independent movement, a pawl carried by one shaft section, a ratchet block adapted to beengaged by the pawl, a spring tending to move thepawl to locked position, and a handle on the other shaft section to release the pawl. v

2. The combination with a door frame and a sliding door, of aligned shaft sections having rotary mounting on the door, means connecting the shaft sections and permitpendent motion of the shaft sections for a ting a slight independent turning movement of the shaft sections, a handle on one shaft section, a pawl on the other shaft section, a ratchet block fixed to the frame, and resilient means exerting the tension on the pawl to force it into engagement with the ratchet block when the door reaches its closed position.

3. The combination with a door frame, and a sliding door, of aligned shaft sections having rotary mounting on the door, means connecting the shaft sections and permitting a slight independent turning movement of the shaft sections, a handle on one shaft section, a pawl on the other shaft section, a ratchet block fixed to the frame, a collar fixed to the pawl carrying shaft section, a coiled. spring around the shaft and fixed to the collar and one of the bearings tending to turn the shaft section and exert spring pressure on the pawl whereby the pawl is permitted a pivotal movement in riding over the ratchet block without moving the other shaft section, and the handle connected thereto.

JUHN n. Kaisnn. 

